The Firefox Browser since version 39 can no longer access the E2E Bridge (Console). You get this error:
In the next days we will release a new E2E Bridge version that solves the problem.
Firefox disabled some insecure configurations to prevent man-in-the-middle attacks. This is a good thing but the JRE 1.6 of the E2E Bridge cannot generate keys that are good enough for a secure SSL communication. In the next E2E Bridge release we will upgrade the JRE to version 1.8 so that the problem is solved and the communication is secure.
Until you install the fixed E2E Bridge release you should use another browser. Be aware that Google Chrome with version 45 also plans to remove support for such insecure configurations.
Alternatively, you can also enable the weak options in Firefox, however this is a global option in Firefox and is used for all connections you do. You have to enter about:config in the Firefox location bar. Accept the next security warning. Enter security.ssl3.dhe_rsa_aes in the search field. You get two entries. Change both entries with a double click to false. You do not have to restart Firefox.